The CARMENES search for exoplanets around M dwarfs

• Verfasst von: Perger, Manuel [VerfasserIn]
• Verfasst von: Ribas, I. [VerfasserIn]
• Verfasst von: Anglada-Escudé, G. [VerfasserIn]
• Verfasst von: Morales, J. C. [VerfasserIn]
• Verfasst von: Amado, P. J. [VerfasserIn]
• Verfasst von: Caballero, J. A. [VerfasserIn]
• Verfasst von: Quirrenbach, Andreas [VerfasserIn]
• Verfasst von: Reiners, A. [VerfasserIn]
• Verfasst von: Béjar, V. J. S. [VerfasserIn]
• Verfasst von: Dreizler, S. [VerfasserIn]
• Verfasst von: Galadí-Enríquez, D. [VerfasserIn]
• Verfasst von: Hatzes, A. P. [VerfasserIn]
• Verfasst von: Henning, Thomas [VerfasserIn]
• Verfasst von: Jeffers, S. V. [VerfasserIn]
• Verfasst von: Kaminski, Adrian [VerfasserIn]
• Verfasst von: Kürster, M. [VerfasserIn]
• Verfasst von: Lafarga, M. [VerfasserIn]
• Verfasst von: Montes, D. [VerfasserIn]
• Verfasst von: Pallé, E. [VerfasserIn]
• Verfasst von: Rodríguez-López, C. [VerfasserIn]
• Verfasst von: Schweitzer, A. [VerfasserIn]
• Verfasst von: Osorio, M. R. Zapatero [VerfasserIn]
• Verfasst von: Zechmeister, Mathias [VerfasserIn]
• Titel: The CARMENES search for exoplanets around M dwarfs
• Titelzusatz: no evidence for a super-Earth in a 2-day orbit around GJ 1151
• Verf.angabe: M. Perger, I. Ribas, G. Anglada-Escudé, J.C. Morales, P.J. Amado, J.A. Caballero, A. Quirrenbach, A. Reiners, V.J.S. Béjar, S. Dreizler, D. Galadí-Enríquez, A.P. Hatzes, Th. Henning, S.V. Jeffers, A. Kaminski, M. Kürster, M. Lafarga, D. Montes, E. Pallé, C. Rodríguez-López, A. Schweitzer, M.R. Zapatero Osorio, and M. Zechmeister
• E-Jahr: 2021
• Jahr: 07 May 2021
• Umfang: 4 S.
• Teil: volume:649
• Teil: year:2021
• Teil: month:05
• Teil: elocationid:L12
• Teil: pages:1-4
• Teil: extent:4
• Fussnoten: Gesehen am 26.08.2021
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2021
• Band/Heft Quelle: 649(2021) vom: Mai, Artikel-ID L12, Seite 1-4
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/202140786
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1767906692

Abstract

<i>Context.<i/> The interaction between Earth-like exoplanets and the magnetic field of low-mass host stars are considered to produce weak emission signals at radio frequencies. A study using LOFAR data announced the detection of radio emission from the mid M-type dwarf GJ 1151 that could potentially arise from a close-in terrestrial planet. Recently, the presence of a 2.5-<i>M<i/><sub>⊕<sub/> planet orbiting GJ 1151 with a 2-day period has been claimed using 69 radial velocities (RVs) from the HARPS-N and HPF instruments.<i>Aims.<i/> We have obtained 70 new high-precision RV measurements in the framework of the CARMENES M-dwarf survey and use these data to confirm the presence of the claimed planet and to place limits on possible planetary companions in the GJ 1151 system.<i>Methods.<i/> We analysed the periodicities present in the combined RV data sets from all three instruments and calculated the detection limits for potential planets in short-period orbits.<i>Results.<i/> We cannot confirm the recently announced candidate planet and conclude that the 2-day signal in the HARPS-N and HPF data sets is most probably produced by a long-term RV variability, possibly arising from an outer planetary companion that has yet to be constrained. We calculate a 99.9% significance detection limit of 1.50 m s<sup>−1<sup/> in the RV semi-amplitude, which places upper limits of 0.7 <i>M<i/><sub>⊕<sub/> and 1.2 <i>M<i/><sub>⊕<sub/> on the minimum masses of potential exoplanets with orbital periods of 1 and 5 days, respectively.